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全部科目 > 软件认证工程师考试 > 思科认证考试 > CCNA系列认证 > CCNA(640-802)

单项选择题

Which of the following protocols uses both TCP and UDP ports?（）

A. SMTP
B. Telnet
C. FTP
D. DNS

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Which command enhances the 802.1D convergence time on ports that are connected to hosts?（）

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B. spanning-tree uplinkfast
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Which IEEE standard protocol is initiated as a result of successful DTP completion in a switch over FastEthernet?（）

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